JP3354871B2 - Conductive polyester resin sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package for storing, transporting, and mounting electronic components, which forms a storage pocket in a package having a function of protecting the electronic components, aligning them for mounting on a printed circuit board, and taking them out. The present invention relates to a conductive plastic sheet suitable for a plastic carrier tape, a carrier tape using the sheet, and a package in which electronic components are packaged using the carrier tape.

[0002]

2. Description of the Related Art Electronic parts are being mounted on the surface by rationalizing the production and responding to the production of a large number of products in small quantities, and plastic carrier tapes are attracting attention as a packaging form applied to the electronic parts. This carrier tape sheet requires antistatic performance to protect the electronic components that are the contents from static electricity, mechanical strength is required for damage due to external pressure, and its thickness is specified. Among electronic components, an IC or the like called a chip-type electronic component has a relatively large weight, and therefore must have a high waist strength, that is, a large bending elastic modulus.

[0003] Various materials have been proposed as suitable for this application, for example, vinyl chloride resin, polyester resin, polystyrene resin, polycarbonate resin, etc. Among them, environmental problems and moldability are excellent. Polyester-based resins are preferably used in view of the above. As a method for imparting conductivity for antistatic performance, carbon black is kneaded into a polyester resin to form a sheet, or a coating containing carbon black is coated on both sides of a base sheet made of a polyester resin. Is generally used. However, polyester resins have considerable difficulty in dispersing carbon black and become brittle when kneaded with carbon black, resulting in reduced mechanical strength such as bending strength and impact resistance. But not very good ones. In addition, since the coating method needs to be applied to both the front and back surfaces, the coating layers on the front and back surfaces have poor lubricity during winding, causing wrinkles, blocking after winding, etc. However, it has the disadvantage of becoming too expensive.

[0004]

SUMMARY OF THE INVENTION The present invention solves such a problem in a carrier tape sheet made of a polyester resin, and has an antistatic performance and a sufficient mechanical property for protecting electronic components as contents. It is an object of the present invention to provide a conductive polyester resin sheet having strength and low cost, a carrier tape using the sheet, and a package in which electronic components are packaged using the carrier tape.

[0005]

The present invention SUMMARY OF THE INVENTION may, antistatic properties possess a coating layer of a conductive paint containing carbon black on one side of the substrate sheet consisting of a saturated polyester resin composition containing a coloring carbon black Is a conductive polyester resin sheet provided with, the surface specific resistance of the sheet, the coating layer side surface is 1 × 10 ⁴ Ω or more,
Less than 1 × 10 ⁸ Ω, the opposite surface of which is 1 × 10 ⁴ Ω or more,
It is a conductive polyester resin sheet having less than 1 × 10 ¹⁴ Ω. Preferably, the base sheet contains an antistatic agent
And, a layer made of a saturated polyester resin composition containing a coloring carbon black (A), free of antistatic agents
A two-layered sheet obtained by laminating a layer (B) made of a saturated polyester resin composition containing carbon black for coloring, and a conductive layer having a coating layer of a conductive paint containing carbon black provided on the surface of the layer B side. Polyester resin sheet, the base sheet contains an antistatic agent ,
A layer (A) comprising a saturated polyester resin composition containing carbon black for color , and a layer containing no antistatic agent ,
A layer (B) made of a saturated polyester resin composition containing carbon black for color laminated by a co-extrusion method;
A conductive polyester resin sheet comprising a sheet having a layer structure, wherein the base sheet contains carbon black for coloring.
A sheet made of a saturated polyester resin composition having a coating layer of a paint containing an antistatic agent provided on one surface, and a coating layer of a conductive paint containing carbon black provided on the surface on the opposite side of the coating layer. It is a conductive polyester resin sheet. Further, preferably, the conductive polyester resin sheet in which the antistatic agent is a polymer type antistatic agent. Further, the present invention is a carrier tape for packaging electronic components using these conductive polyester resin sheets, and an electronic component packaging body in which electronic components are inserted into the carrier tape for packaging electronic components and sealed with a cover tape.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The saturated polyester resin used in the present invention is obtained by condensation of a dibasic acid and a glycol, such as polyethylene terephthalate (PET) obtained from ethylene glycol and terephthalic acid, and phthalate. As a polyethylene terephthalate copolymer having a saturated dibasic acid such as an acid, isophthalic acid, sebacic acid, adipic acid, azelaic acid, glutaric acid, succinic acid, oxalic acid, and a diol component,
In addition to a polyethylene terephthalate copolymer or a blend thereof using 1,4-cyclohexanedimethanol, diethyl glycol, propylene glycol or the like as a copolymer component, polybutylene terephthalate (PBT),
4-cyclohexylene dimethylene terephthalate (PC
T), polyarylate (PAR), polyethylene naphthalate (PEN), poly-p-oxybenzoyl, copolymers thereof and the like are used. Further, a polymer alloy composed of two or more resins selected from the above-mentioned saturated polyester resins, a polymer alloy of a saturated polyester resin with another resin such as a polycarbonate resin, an ABS resin, a polyphenylene ether resin, and the like are also used.

The base sheet made of the saturated polyester resin composition used in the present invention has a surface resistivity of 1 × 1.
0 ⁴ Omega above method 1 × 10 it is necessary to impart antistatic properties to be less than ¹⁴ Omega, as the method, the antistatic agent is contained in the saturated polyester resin composition performs sheeting, charging A two-layer sheet obtained by laminating a layer (A) composed of a saturated polyester resin composition containing an antistatic agent and a layer (B) composed of a saturated polyester resin composition containing no antistatic agent, by a co-extrusion method, Examples thereof include a method of laminating by a dry laminating method, an extruding laminating method, and the like, a method of providing a coating layer of a paint containing an antistatic agent on one surface of a base sheet made of a saturated polyester resin composition, and the like. Among them, the co-extrusion method is preferred because the layer (A) made of the saturated polyester resin composition containing an antistatic agent can be made inexpensive by making it thinner. Various additives such as antioxidants, stabilizers, ultraviolet absorbers, lubricants, and fillers can be added to the saturated polyester resin composition, if necessary, as long as the basic performance is not impaired.

The antistatic agent used in the present invention includes:
Examples of the resin composition having antistatic properties include a polymer type antistatic agent, an anionic antistatic agent, a cationic antistatic agent, a nonionic antistatic agent, and an amphoteric antistatic agent. Among them, a polymer type antistatic agent is preferable because of its permanent antistatic effect. Examples of the polymer type antistatic agent include polyether type, polyether ester amide type, polyamide type, modified polyamide type, siloxane type and the like. It is appropriate that the surface specific resistance value of the antistatic surface is 1 × 10 ⁴ Ω or more and less than 1 × 10 ¹⁴ Ω. If it is 1 × 10 ¹⁴ Ω or more, the surface resistivity of the pocket portion after the formation of the carrier tape becomes large, so that the required antistatic performance cannot be obtained. On the other hand, if it is less than 1 × 10 ⁴ Ω, it is not preferable because the electronic components of the contents are destroyed when electricity is supplied from outside.

[0009] One side of the base sheet made of the saturated polyester resin composition having antistatic properties of the present invention is coated with a conductive paint containing carbon black. The conductive paint used has a resin component, carbon black, and a solvent as main components. As the resin component, an acrylic resin, a polyester resin, a polyester urethane resin, a polyvinyl chloride resin, or the like is used. As the carbon black, those having an average particle diameter of less than 0.08 mm are preferably used. As the solvent, an ester, an alcohol, a hydrocarbon or the like is used.As the ester, ethyl acetate, butyl acetate, or the like is used.As the alcohol, methanol, ethanol, isopropyl alcohol, or the like is used. For example, toluene, xylene, turpentine oil or the like is used. The content of each main component is 1 to 50% by weight for the resin component and 1 to 1 for carbon black.
5% by weight, and the solvent ranges from 35 to 90% by weight.
In addition to these main components, a dispersant, a plasticizer, and the like may be appropriately used as additives in the conductive paint.

The method for applying the conductive paint in the present invention is not particularly limited, but a method such as a gravure coating method, a roll coating method, and a dip coating method is used. If sufficient adhesion strength cannot be obtained, the surface coated with the sheet may be subjected to a corona treatment or a primer treatment with another coating agent.
The specific resistance of the coating layer side surface of the conductive paint is 1 × 1
0 ⁴ Omega to less than 1 × 10 ⁸ Ω are suitable. 1 × 10 ⁸
If it exceeds Ω, the surface resistivity of the pocket portion after forming the carrier tape becomes large, and the effect of preventing electrostatic breakdown of electronic components cannot be exhibited, which is not preferable. 1 × 10 ⁴ Ω
If it is less than this, it is not preferable because the electronic components of the contents are destroyed when energized by external electricity.

The saturated polyester resin composition of the present invention comprises:
It shall be the black sheet by containing a coloring carbon black. An appropriate amount of the carbon black for coloring is 0.3 to 3 parts by weight based on 100 parts by weight of the saturated polyester resin composition. If the amount is less than 0.3 parts by weight, the corners of the pocket portion after the carrier tape is formed, which tends to be particularly thin, are undesirably transparent.
If 3 parts by weight is added, sufficient coloring is possible, and if it exceeds 3 parts by weight, it becomes unfavorable since it starts to become brittle in physical properties. The thickness of the sheet of the present invention is in the range of 0.15 to 1.00 mm, and in particular, the range of 0.20 to 0.50 mm is suitable as the thickness for embossed carrier tape applications.

The method for producing the carrier tape for packaging electronic parts using the conductive polyester resin sheet of the present invention is not particularly limited, but the vacuum forming method and the pressure forming method conventionally used as the method for forming the carrier tape have been used. It is produced by a press molding method or the like. The method of manufacturing a package in which electronic components are wrapped using the carrier tape is not particularly limited, but the electronic component is inserted into a molding pocket portion of the carrier tape by a taping machine and sealed by a cover tape. .

[0013]

EXAMPLES The present invention will be described below by way of examples, which are merely examples, and the present invention is not limited thereto. A layer (A) comprising a saturated polyester resin composition containing an antistatic agent and containing a carbon black for coloring using the following raw materials and a saturated polyester resin containing a carbon black for coloring but not containing an antistatic agent A 0.3 mm-thick sheet having a two-layer structure in which a layer (B) made of a polyester resin composition was laminated was produced by a co-extrusion method.
The thickness ratio was set to A / B = 10/90%.

(Example 1 ) Layer A: MA-530H (PET, manufactured by Mitsubishi Rayon Co., Ltd.) 100 parts by weight Pelestat 6321 12 parts by weight Coloring carbon black 1 part by weight Layer B: MA-530H 100 parts by weight For coloring 1 parts by weight of carbon black

(Example 2 ) Layer A: 100 parts by weight of PETG6763 12 parts by weight of Pelestat 6321 1 part by weight of carbon black for coloring B layer: 100 parts by weight of PETG6763 1 part by weight of carbon black for coloring (Example 3 ) Layer A: NOVADUR5010 100 parts by weight Chemistat 3100 2 parts by weight Coloring carbon black 1 part by weight B layer: NOVADUR5010 100 parts by weight Coloring carbon black 1 part by weight

As the conductive paint, a polyvinyl chloride resin, carbon black, and a solvent (a mixed solvent of toluene / methyl ethyl ketone / ethyl acetate) in a weight ratio of 30: 6:
The mixture was blended at a ratio of 64, and a dispersant, a plasticizer, and an antioxidant were appropriately added, and then mixed by a ball mill for 30 minutes to prepare a mixture. This conductive paint was applied to the B layer side surface of the above-described two-layer sheet by a gravure coating method (using a gravure roll having a 200-line depth of 30 μm) to produce a conductive polyester resin sheet.

[0017]

Comparative Example 1 A single-layer sheet having a thickness of 0.3 mm was produced using the same raw material (PETG6763) as the layer B of Example 2. On one side of the obtained sheet, Examples 1 to
The same conductive paint as in No. 7 was applied by the same method to prepare a conductive polyester resin sheet. (Comparative Example 2) The same single-layer sheet as in Comparative Example 1 was prepared, and the same conductive paint as in Comparative Example 1 was applied to both surfaces thereof by the same method to prepare a conductive polyester resin sheet. (Comparative Example 3) Using the following raw materials, a three-layer structure of C layer / D layer / C layer composed of a conductive saturated polyester resin composition layer (C) and a saturated polyester resin composition layer (D) was used. A sheet having a thickness of 3 mm was prepared by a co-extrusion method to obtain a conductive polyester resin sheet. The thickness ratio was C / D / C = 10/80/10%. Layer C: PETG6763 100 parts by weight Carbon black 20 parts by weight Layer D: PETG6763

The following sheet properties of the conductive polyester resin sheets obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were measured by the following methods. The results are shown in Tables 1 and 2 . Surface specific resistance: Measured on the conductive coat side (in Comparative Example 3 on either one side) and on the opposite side according to JIS-K-6911. Folding strength: The number of bending times is 5 according to JIS-P-8115.
Those that did not crack after 01 times or more were rated as ○, and those that broke after 500 times or less were rated as x. Sheet appearance: Good was evaluated by ○ and bad was evaluated by ×.

[0020]

[Table 1]

[0021]

[0022]

[0023]

[Table 2]

As shown in Table 1, the sheet properties of the conductive polyester resin sheet of the example of the present invention were not particularly problematic, and were useful as a carrier tape sheet. Further, as shown in Table 2 , the sheet of Comparative Example 1 had a high surface resistivity of 1 × 10 ¹⁵ or more on the side opposite to the conductive coat, and was unsuitable as a carrier tape sheet. The sheet of Comparative Example 2 had wrinkles during coating, blocking after winding and poor sheet appearance, and the sheet of Comparative Example 3 had poor appearance due to poor dispersion of carbon black and was unsuitable as a carrier tape sheet. there were. Using the conductive polyester resin sheet according to the present invention, a carrier tape was produced by air pressure molding with a carrier tape molding machine, but no problem was found and a good carrier tape was obtained. Further, using the obtained carrier tape, a taping machine is used to form an IC as an electronic component in the molding pocket.
Was inserted and sealed with a cover tape. As a result, a package was produced without any particular problem.

[0025]

According to the present invention, the conductive polyester resin sheet according to the present invention can be used for a carrier tape sheet made of a conventional polyester resin. It has no reduction in mechanical strength, has antistatic performance and sufficient mechanical strength for protecting electronic components as contents, and can be manufactured at low cost, and is optimal as a carrier tape sheet.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 C08J 7/04

Claims (7)

(57) [Claims] 1. A possess antistatic properties, carbon black for coloring
Is a conductive polyester resin sheet provided with a coating layer of a conductive paint containing carbon black on one surface of a base sheet made of a saturated polyester resin composition containing a rubber. A conductive polyester resin sheet having a layer side surface of 1 × 10 ⁴ Ω or more and less than 1 × 10 ⁸ Ω and an opposite surface of 1 × 10 ⁴ Ω or more and less than 1 × 10 ¹⁴ Ω. 2. The base sheet contains an antistatic agent and is colored.
(A) consisting of a saturated polyester resin composition containing carbon black for coloring, without containing an antistatic agent , and colored
A sheet having a two-layer structure in which a layer (B) made of a saturated polyester resin composition containing carbon black for use is laminated, and a coating layer of a conductive paint containing carbon black is provided on the surface of the B layer. The conductive polyester resin sheet according to the above. 3. The base sheet contains an antistatic agent and is colored.
(A) consisting of a saturated polyester resin composition containing carbon black for coloring, without containing an antistatic agent, and colored
3. The conductive polyester resin sheet according to claim 2, comprising a two-layer sheet obtained by laminating a layer (B) made of a saturated polyester resin composition containing carbon black for use by coextrusion. 4. The base sheet is made of carbon black for coloring.
A sheet of a saturated polyester resin composition containing a coating layer of a paint containing an antistatic agent provided on one surface, and a coating layer of a conductive paint containing carbon black on the surface on the opposite side of the coating layer. The conductive polyester resin sheet according to claim 1, further comprising: 5. The conductive polyester resin sheet according to claim 1, wherein the antistatic agent is a polymer type antistatic agent. 6. A carrier tape for packaging electronic parts, comprising the conductive polyester resin sheet according to claim 1, 2 , 3 , 4 , or 5 . 7. An electronic component package in which an electronic component is inserted into the electronic component packaging carrier tape according to claim 6 , and sealed with a cover tape.